Object: null prototype {}--multer

Question

It seems that when multer is handling the body req it's not getting the information and I'm getting that error above but when I don't use multer every thing is great, this is my code:

router.post("/", upload.single("image"), async (req, res) => {
  console.log(req.body);
  let post = new Post({
    title: req.body.title,
    desc: req.body.desc,
    image: req.body.filename,
  });
  try {
    post = await post.save();
    res.status(201).redirect("/posts");
  } catch (err) {
    console.log(`upload.single error: ${err}`);
  }
});